Define the function z = f(@,y) = vay - xy. Suppose that a and y are functions of t as follows: x(t) = a + bt and y(t) = ct. 1. Substitute x(t) and y(t) into f(x, y) to obtain g(t) = f(x(t), y(t)). Calculate dg(t)/dt. 2. Calculate do(t)/dt using the Chain Rule for functions of 2 variables. How does your result compare to the result in